freightliner 122SD, Maintenance Manual

Page: 89 / 132

41–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.
41–01 Driveline Inspection
1. Park the vehicle on a flat, level surface, apply
the parking brakes, and chock the tires.
WARNING
Self-locking bearing-cup or bearing-strap cap-
screws must not be reused; replace the cap-
screws with new ones. Also, do not undertighten
or overtighten any bearing-cup or bearing-strap
capscrews. A loose or broken fastener at any
point in the driveline weakens the driveline con-
nection, which could cause serious vehicle dam-
age, or could result in a driveshaft separating
from the vehicle, possibly causing loss of vehicle
control that could result in serious personal injury
or death.
2. Check the torque of the bearing-cup or bearing-
strap capscrews; see
Table 1 for installed torque
values.
Remove and discard any loose capscrews. Do
not reuse any loosened self-locking capscrews;
they are designed for one-time installation only.
Replace all loosened and removed capscrews
with new ones. Tighten the new capscrews as
specified in
Table 1 .
For half-round yokes with bearing straps , tighten
the bearing-strap capscrews following the tight-
ening sequence shown in
Fig. 1 , in increments
of 20 lbf·ft (25 N·m) to the torque specifications
listed in
Table 1 .
Bearing Cap or Bearing Strap Capscrew Torque
Specifications
U-Joint Type Torque: lbf·ft (N·m)
Half-Round Yokes with Bearing
Straps and 3/8-inch Capscrews
(see
Fig. 2 , Ref. 8)
45–60 (60–80)
Half-Round Yokes with Bearing
Straps and 1/2-inch Capscrews (
Fig. 2 , Ref. 8)
130–135 (175–185)
Full-Round Yokes with Bearing
Cups (
Fig. 3 )
43 (58)
RPL Series U-Joints with
Bearing Cups (
Fig. 4 )
125 (169)
Table 1, Bearing Cap or Bearing Strap Capscrew
Torque Specifications
3. Check the driveline yokes for cracks, and check
end-yokes for looseness; see
Fig. 2 .
Replace cracked yokes.
If any end-yoke can be moved in or out on its
shaft, or can be rocked on its shaft, disconnect
the driveshaft and U-joint from the yoke, then
check the drive component’s shaft seal for leak-
age or other visible damage that may have been
caused by the loose yoke. Replace the seal if
needed, then tighten the yoke nut. Refer to
Sec-
tion 41.00, Specifications 400 of the 122SD and
Coronado Workshop Manual for torque specifica-
12/16/2008 f410529
2
1
2
1
Tighten the capscrews in a counterclockwise sequence,
starting with either number 1 position.
Fig. 1, Tightening Sequence, Half-Round Yoke Bearing
Strap Capscrews
Driveline
41
122SD and Coronado 132 Maintenance Manual, February 2016
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